ensure that all child hooks get normalized

lib/herd.js

@@ -16,7 +16,7 @@ function Herd(config){
   Hook.call(herd, herd.configFrom(config))
 
   if (!(herd.childHooks && Array.isArray(herd.childHooks))) herd.childHooks = []
-  herd.childHooks = herd.childHooks.map(herd.configFrom, herd)
+  herd.childHooks = herd.childHooks.map(herd.childConfigFrom, herd)
 
   herd.on('hook::ready', function(){
     herd.listening = true // workaround hook.io bug
@@ -45,6 +45,8 @@ Herd.prototype.ignoreSTDIN = true
 // array of child hook configs
 Herd.prototype.childHooks = null
 
+Herd.prototype.childConfigDefaults = {
+}
 Herd.prototype.normalizeConfigSrc = function(config, module){
   if (config.type) {
     config.src = 'hook.io-' + config.type
@@ -55,6 +57,20 @@ Herd.prototype.normalizeConfigSrc = function(config, module){
   }
   return config
 }
+
+Herd.prototype.childConfigFrom = function(childConfig){
+  childConfig = this.configFrom(childConfig)
+
+  for (var key in this.childConfigDefaults) {
+    if (childConfig.hasOwnProperty(key)) continue
+    childConfig[key] = this.childConfigDefaults[key]
+  }
+
+  var parentModule = this.configFilePath ? requireModule(this.configFilePath) : childConfig.parentModule
+  this.normalizeConfigSrc(childConfig, parentModule)
+
+  return childConfig
+}
 
 Herd.prototype.configFrom = function(config){
   if (!config.configFilePath) return config